Im using multiple shell provisioners with vagrant. The first shell provisioner sets some environment variables within \~/.bashrc and \~/.bash\_profile like `export HTTP_PROXY="http://127.0.0.1"`. But for the following provisioners the environment variables are not set or empty. So are the shell provisioners neither using login nor non-login shells to source .bashrc or .bash\_profile? But also using `source ~/.bashrc` within the shell script itself does not work. When i log in all environment variables are set.